Demographics & People — Lemont, Illinois
Population Overview
| Population (Census) | 17,643 |
| Estimated 2026 | ~18,200 |
| Median Age | 43.7 |
| Total Households | 6,334 |
| Family Households | 4,632 |
| Average Household Size | 2.74 |
| Diversity Index | 0.222 (somewhat diverse) |
Race & Ethnicity
| White | 15,565 |
| Black or African American | 235 |
| Asian | 265 |
| Hispanic or Latino | 1,690 |
Heritage & Ancestry
| Group | Count |
| Polish | 4,861 |
| Irish | 2,760 |
| German | 2,665 |
| Unclassified or not reported | 2,615 |
| Italian | 2,401 |
| Other groups | 2,096 |
| Lithuanian | 1,736 |
| Hispanic: Hispanic or Latino | 1,222 |
| Hispanic: Mexican | 1,099 |
| English | 663 |
Language
| English Only | 12,509 |
| Spanish | 483 |
| Population 5+ | 16,801 |
Veterans
| Veterans | 696 |
| Population 18+ | 13,474 |
Commuting
| Mean Commute Time | 34.8 minutes |
| Work from Home | 17.1% |
| Commuter Profile | N/A |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Lemont, Illinois.